自发式文化创意产业集聚区发展演变研究

自发式文化创意产业集聚区是最具发展活力的文化创意产业集聚区之一。本文以北京宋庄文化创意产业集聚区发展为例,从自发式文化创意产业集聚区发展的萌芽、形成、发展—成熟、停滞—繁荣/衰退四个阶段,研究其发展的动力因素和特征。在此基础上,针对其所面临的问题提出区域协调规划,拓展发展空间;延伸产业链条,提升发展层次;加强政策引导,提高管理水平等对策建议,以促进自发式文化创意产业集聚区在新的发展阶段的健康持续发展。     

基于GIS的商业网点管理系统研究

针对商业网点管理中的应用需求,探讨了利用GIS改善商业网点管理的可行性,并利用GIS技术改进了传统的商业网点管理应用模型,根据这些模型,开发出了基于GIS的商业网点管理系统,并对该系统进行了实际应用,表明该系统能够提高网点管理效率和科学性。     

Unfolding core asymmetries with x-ray emission images in symmetry diagnostic experiments

A novel inversion technique is proposed to unfold core asymmetries at the source with x-ray emission images, which were obtained from imploded surrogate capsules in symmetry diagnostic experiments. The axisymmetrical core emission can be expanded as a Fourier series, with Legendre polynomials and spherical Bessel functions as bases concerned with polar angle and radius, respectively. A least-squares estimator is employed to obtain the unknown coefficients from its two-dimensional image data. The unfolded Legendre coefficients can be further used to test modeling of drive asymmetries in hohlraums. This technique is also demonstrated with a proof-of-principle experiment performed on the Shenguang II laser facility [L. Zunqi et al., Chin. J. Lasers B10, 6 (2001)].     

Impact of Informatization on Macro Economy and Finance in China

The process of Informatization will have great impact on both macro economy and finance. In the respect of macro economy, informatization influences short-term economic fluctuation, the growth of total economic scale and economic structure in China. Firstly, it will influence short-term economic fluctuation by affecting labor market, pricing fluctuation, short-term investment and consumption, as well as the implementation of macroeconomic policy. Meanwhile, it will boost long-term economic growth by providing new production factors, upgrading production efficiency and pushing technology innovation. In addition, it will change economic structure by impacting industry structure, demand structure and regional structure. On the perspective of finance, informa-tization has changed the monetary form and function, which is the technological foundation of virtual currency and electronic payment. It exerts an extensive and far-reaching impact on the financial institutions, financial mar-ket, financial supervision and regulation through two ways: decreasing the transaction costs and alleviating the asymmetric information problems.     

新型语法分析器构造的研究

文中阐述了语法分析器构造的研究现状和构造过程中存在的问题;在讨论向前看多个符号必要性的基础上,分析了向前看多个符号的新型语法分析器构造方法;指出了语法分析器构造研究中待解决的若干问题。     

基于XGBoost的Ebay网上拍卖最终成交价格预测

对成交价格进行预测,旨在获得Ebay拍卖品的价格动态,使买卖双方更好地进行交易.将价格区间进行多分类划分和多次最优参数选择,建立极端梯度提升(XGBoost,eXtreme Gradient Boosting)模型,并与最优逻辑斯蒂回归模型比较,使用平均准确率作为模型的评估指标.经比较发现XGBoost模型达到90.5...     

试论企业财务管理

财务管理工作是现代企业中的一个庞大而严密的管理系统，从会计核算、财务信息、财务分析、财务管理、财务理财、财务评价等6个层面对企业如何开展财务管理工作进行了论述。     

分子生物学技术在浸矿微生物研究中的应用

分子生物学技术在浸矿微生物的研究中发挥着举足轻重的作用。总结了一些先进分子生物学技术在浸矿微生物鉴定和浸矿微生物基因工程育种两方面的应用情况,包括16S rRNA和16S rDNA基因序列分析技术、实时定量PCR技术、限制性片段长度多态性分析技术、荧光原位杂交技术、变性梯度凝胶电泳和温度梯度凝胶电泳技术、基因间隔序列分析技术、浸矿微生物质粒载体研究、外源基因导入浸矿微生物方法研究等。     

Generation of hydrogen from aluminum and water - Effect of metal oxide nanocrystals and water quality

Metal Oxides nanocrystals such as TiO₂, Co₃O₄, Cr₂O₃, Fe₂O_3, Mn₂O₃, NiO, CuO and ZnO were used as modifiers on the metallic aluminum (Al) powders for the production of hydrogen in deionized water or tap water at room temperature. In particular, the influences of TiO₂ nanocrystals with various crystal sizes on the production of hydrogen from the reaction in tap water under ambient condition were investigated in details. It was found that hydrogen was barely generated from metal Al powders in tap water at 25-45 °C but significantly produced in deionized water above 35 °C without any modifiers. TiO₂, Co₃O₄, and Cr₂O₃ nanocrystals were very effective to promote hydrogen generation from the reaction of Al and deionized water at 25 °C. In addition, while other oxide nanocrystals were ineffective to promote hydrogen generation in tap water, TiO₂ nanocrystals (P90, ∼14 nm in diameter) were found to be highly effective in facilitating the production of hydrogen from the reaction of Al with tap water, comparable to the well-known γ-Al₂O₃. The production of hydrogen over time was found to be dependent on the passive layer of metal Al, where Al(OH)₃ plays an important role during reaction. Pitting is proposed as the major mechanism behind the production of hydrogen in the nanocrystals TiO₂ (P90)-modified Al/tap water system, which is thought to be originated from point defects, and differ considerably from the uniform corrosion model.     

Single-step flash-heat synthesis of red phosphorus/graphene flame-retardant composite as flexible anodes for sodium-ion batteries

Nano Research - Red phosphorus (RP) has attracted considerable attention as the anode for high-performance Na-ion batteries, owing to its low cost and high theoretical specific capacity of ∼...